what the hell is a nug i keep hearin people say it but i dunno what it means. im good on most other words its just this one i got trouble with.
1 Improper use of contact lenses or steroid eyedrops can lead to fungal infections, which in turn can cause corneal ulcers. Also, a corneal injury that results in plant material getting into the eye can lead to fungal keratitis.  Acanthamoeba are microscopic, single-celled amoeba that can cause human infection.
Corneal ulcer. A corneal ulcer is usually due to a bacteria or virus causing a painful, red eye. The corneal ulcer may feel like something is in the eye irritating it and there may be increased sensitivity to light. People who get a lot of cold sores often develop corneal ulcers.